This volume of 50 promising programs and practices in mathematics and science education provides an array of innovative ideas of interest to K-12 teachers and persons involved in teacher education. These models of programs and practices can be used to improve teaching and learning in mathematics and science education. They can also be used to modify and adapt one's own practices in the classroom, to prepare on-going professional development experiences to improve and increase the effectiveness of practices already being used, and to suggest ways in which teachers can collaborate with developers to produce new and better practices. In addition, this publication includes an annotated listing of 67 practices selected for the 1994 edition, as well as effective practices recognized by the U.S. Department of Education. Also included is information about the National Diffusion Network, the Eisenhower National Clearinghouse for Mathematics and Science Education, and promising practices from the Laboratory Network Program. The programs are arranged in alphabetical order and contain the following information: subject, target audience, general description, grade level, teaching strategies, assessment tools, evidence of effectiveness, resources needed for implementation, contact information, site(s), and the Eisenhower regional consortium that submitted the entry. (MKR)